Improvement in stave-sawing machines



c. T. WATSON..

Stave Sewing Machine.

No.`111,41 4. Patented Jany 31, 1871.

CHARLES 'THOMPSON WATSON, OFDEERFIELD, MICHIGAN.A

LettersPatent No. 111,414, dated January 31, 187,1.

IMPRov'EMENT IN SITAvE-sAwlNc MACHINES.

The `S; ::1'xedule refened to in these LQtteraPAatent and making part of thevsame.

To all whom it may concern Be it known that I, CHARLES f THOMPSON WAT- SON, of `Deerlield, -in the conntyof Lenawee and State of Michigan, have invented certain new and use. fullmprovements in Stare-sawing AMachines and l do hereby declare the following to be a full and correct description -of the same, reference being had to the accompanying drawing. in which Y Figure 1 is a vertical central .longitudinal section of the machine.

Figure 2 is a transverse vertical section, looking toward the rear of the machine; and

Figure 3 is a similar section, looking toward the front ofthe machine.

The same letter indicates the saine part in all the figures. v .The nature'. of this invention consists in the peculiar method ofhanging, supporting, guiding, and driving the saw, allas `hereinafter more particularly set forth. l

To enable others to make and use my machine, I will proceedto describe its construction and operation.

-A stout frame, A, supports parallel curved ways, P, on which the carriage N, carrying the block from which the staves are to be cut, is to traverse.

Firmly att-ached to these ways, and depending transversely from them, is -the large disk B, circular in general outline, to which the saw-guiding and oper# atingvmechanism is attached.

This disk is perforated with radial slots, C C, &c.,

` in which the saw-guides and vdriving mechanisrnare received and adjusted.

The sawS is a hoop-saw, having teeth on its front edge, as shown. It is perforated throughout its length 'with holes, ii, which receive pins or teeth, tt,'pro

jecting from the periphery of the driving-wheel D.

This wheel is xed to the front end of the shaft E, on which is -pulley F, to which a driving-belt from a suitable drum, imparts the requisite motion.

The rear end of shaft E works in an adjustable' journal-box (not shown) supported by the pendent bracket G.

The forward portion of shaft E turns in an adjustable journal-box, E', clampedto the disk B, as shown in figs. l and 3. The object`of this adjustability of vthe journal-boxes is to adapt the driving-wheel' to saws of' different diameters. The same reason applies to all the supports and guides oi' the saw.

These areall held to the disk by metallic clamps.y

a: a, 85o., controlled by screws passing through the slots C in the disk B, as clearly shown in iig. 3.

By loosening the screws the clamps-are released, and any desired adjustment of the parts can be made and fixed.

The saw has a groove, g, threnlghoutv its'length,

which receives a tongue, h, projecting. from'the-pevents lateral 'vibration of the saw.l

As a further or alternativeuieans of preventing lateralrnotion, I place near the bottom of the saw a loose pinion or roller, J, having teeth in its periphery, which enter the slot-s i i in the saw-blade.

.Unsteadiuess ot' motio'n is the principal evil to be apprehended in the use of the hoop-saw. When run between ordinary iiictionrolle1s, it' is apt to take on a a violent lateral vibration at that part of the circle opposite to that at which the work is being performed, causing great lfriction and strain, and marring the quality of the work from a portion of thevibratory actionnecessarily extending to that part or the saw engaged in work. The surfaces df the friction-rollers soon wear away in an uneven manner, and theirjournais, owing to the high speed, heat and give way, 11ecessitating constant expense and stoppage for repairs. I'propose to substitute for the ordinary frictionrollers fixed adjustable bearings. or lugs, represented in the drawing by H H' M 2M', placed on both sides of the saw, which runs in contact with and between' them. These bearings I-prefer to make of glass, but may make them of steel or other metal, or with a surface of 'properlypolished rawhide. These lugs are` clamped and adjusted to the disk B in theJ manner before described.

L marks the bracket of an ordinary liction-roller bearing on the outside of the saw. v

I and are, respectively, the brackets of thc rollers 1 and K', having tongues, h h, entering the groove g on the inside of the saw.

The upper part of the frame consists of' the curve ways P, which have the ordinary curve of' a stave, and support the carriage N, in which the block to be sawed rests. r

The block is held between teeth, c, at one end'ot' the carriage, and a pendulous dog, d, suspended at -the other end, and controlled by a horizontal cam, b,

operated by the cranica, to throw the dog forward, or allow it to swing backward, as desired.

The carriage is anoblong box, ofsuitable dimerisions, without top or bottom, and provided at its corners with wheels or rollers, a' w, which rest upon and traverse the ways P.

When the block or bolt is .placed in the carriage, its lower surface rests upon the cross-supports T, which are attached, by adjustable screw-bolts, c c, to the lower side of the ways P. The vertical distance between the upper sides of these supports and the inner surface of the saw is the gaugeof the thicknes@ of the stave, and4 can be regulated at 4will by .means of the screw-bolts n o. The. curvatureof the supporting-bars T should correspond with that of the saw, in order to give a rm and even bearing to the bottom of the bolt.v

The curved ways are int-ended for use on staves which require to be curved-from end to end. But it is sometimes desired to cut straight staves, and for that purpose I have attached on the sides of the curved ways P, by the pivots e c, lthe slotted arms'Q Q, the outer ends of which can be raised up when required, so as to form a straight way upon which the caruage N will traverse Ain a horizontal line. This will produce a staverwhich is the segment of a true cylinder.

The operation of the machine has necessarily been inferred from the-description of l its construction, and

needs no further lucidation.

What I claim, and desire to secure by Letters Pat'- lent, is-

.and for the purpose stated.

The above specification of my said invention signed and witnessed at lVashington this 26th day of March, A. D. 1870. y

CHARLES THOMPSON WATSON.

Witnesses: n

WILLIAM W. DEANE, OHA's. F. STANsBURY. 

